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Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Derivative financial instruments |  | $ 267
Net operating losses | $ 13,643 | 5,525
Research and development credits | 23,012 | 21,494
Depreciation | 5,457 | 3,886
Valuation reserves and accrued liabilities | 9,667 | 5,553
Foreign tax credit | 6,926 | 1,654
Stock compensation | 4,508 | 3,129
Inventory | 1,571 | 1,622
Patents | 218 | 156
Defined benefit obligation | 2,306 | 2,011
Other credits | 639 | 639
Other | 116 | 10
Deferred tax assets, gross | 68,063 | 45,946
Valuation allowance | (19,304) | (13,418)
Deferred tax liabilities: |  |
Intangible assets | (8,442) | (10,161)
Unrealized foreign currency exchange gains | (285) | (3,797)
Undistributed profits of subsidiary | (12,002) | (3,254)
Property and equipment | (470) | (696)
Other | (319) | (342)
Deferred tax liabilities, gross | (21,518) | (18,250)
Net deferred tax asset | $ 27,241 | $ 14,278

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